使用join和tokio的Rust并发性

use tokio::time::{sleep, Duration};

#[tokio::main]
async fn main() {
    let task1 = tokio::spawn(async {
        sleep(Duration::from_secs(2)).await;
        println!("Task 1 completed");
    });

    let task2 = tokio::spawn(async {
        sleep(Duration::from_secs(1)).await;
        println!("Task 2 completed");
    });

    join!(task1, task2);
    println!("All tasks completed");
}

use tokio::time::{sleep, Duration};

#[tokio::main]
async fn main() {
    let task1 = tokio::spawn(async {
        sleep(Duration::from_secs(2)).await;
        println!("Task 1 completed");
    });

    let task2 = tokio::spawn(async {
        sleep(Duration::from_secs(1)).await;
        println!("Task 2 completed");
    });

    tokio::select! {
        _ = task1 => println!("Task 1 finished first"),
        _ = task2 => println!("Task 2 finished first"),
    }

    println!("All tasks completed");
}

use tokio::time::{timeout, sleep, Duration};

#[tokio::main]
async fn main() {
    let task = tokio::spawn(async {
        sleep(Duration::from_secs(5)).await;
        println!("Task completed");
    });

    if let Err(_) = timeout(Duration::from_secs(3), task).await {
        println!("Task timed out");
    } else {
        println!("Task completed within timeout");
    }
}